TY - JOUR

T1 - Spatial Beam Self-Cleaning in Second-Harmonic Generation

AU - Krupa, K.

AU - Fona, R.

AU - Tonello, A.

AU - Labruyère, A.

AU - Shalaby, B. M.

AU - Wabnitz, S.

AU - Baronio, F.

AU - Aceves, A. B.

AU - Millot, G.

AU - Couderc, V.

PY - 2020/4/29

Y1 - 2020/4/29

N2 - We experimentally demonstrate the spatial self-cleaning of a highly multimode optical beam, in the process of second-harmonic generation in a quadratic nonlinear potassium titanyl phosphate crystal. As the beam energy grows larger, the output beam from the crystal evolves from a highly speckled intensity pattern into a single, bell-shaped spot, sitting on a low energy background. We demonstrate that quadratic beam cleanup is accompanied by significant self-focusing of the fundamental beam, for both positive and negative signs of the linear phase mismatch close to the phase-matching condition.

AB - We experimentally demonstrate the spatial self-cleaning of a highly multimode optical beam, in the process of second-harmonic generation in a quadratic nonlinear potassium titanyl phosphate crystal. As the beam energy grows larger, the output beam from the crystal evolves from a highly speckled intensity pattern into a single, bell-shaped spot, sitting on a low energy background. We demonstrate that quadratic beam cleanup is accompanied by significant self-focusing of the fundamental beam, for both positive and negative signs of the linear phase mismatch close to the phase-matching condition.

KW - STIMULATED BRILLOUIN-SCATTERING

KW - SINGLE-MODE

KW - MULTIMODE

KW - FIBER

KW - INSTABILITIES

KW - CONDENSATION

KW - CAVITY

KW - WAVES

UR - http://www.scopus.com/inward/record.url?scp=85083995730&partnerID=8YFLogxK

U2 - 10.1038/s41598-020-64080-7

DO - 10.1038/s41598-020-64080-7

M3 - Article

C2 - 32350305

AN - SCOPUS:85083995730

VL - 10

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 7204

ER -